I am not sure if you wrote this yourself or if you got it elsewhere.
This code is incorrect.
The whole concept of a change event is that the 'target' is passed to the event. eg, if you wrote this code
you would be able to find out which cell has changed. So in your case, you are trying to execute your code only when one of your percentages crosses the threshold. To do this, you will need to have a before and after cell so that you can trap the change. So maybe in column K you can paste the % from the previous update, then in column L you could put a formula that traps if the percentage change is above your threshold AND if the previous percentage change is below your threshold. Make this column evaluate to TRUE or FALSE. Then you don't really need a bell at all, you can just look at the True items and see the ones you need to look at. But assuming you had such a column L
Then something like this
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